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    </style>
    <title>Title</title>
</head>
<body>
<h1>Isotope - filtering &amp; sorting</h1>
<h2>Filter</h2>
<div id="filters" class="button-group">  <button class="button is-checked" data-filter="*">show all</button>
    <button class="button" data-filter=".metal">metal</button>
    <button class="button" data-filter=".transition">transition</button>
    <button class="button" data-filter=".alkali, .alkaline-earth">alkali and alkaline-earth</button>
    <button class="button" data-filter=":not(.transition)">not transition</button>
    <button class="button" data-filter=".metal:not(.transition)">metal but not transition</button>
    <button class="button" data-filter="numberGreaterThan50">number > 50</button>
    <button class="button" data-filter="ium">name ends with &ndash;ium</button>
</div>

<h2>Sort</h2>
<div id="sorts" class="button-group">  <button class="button is-checked" data-sort-by="original-order">original order</button>
    <button class="button" data-sort-by="name">name</button>
    <button class="button" data-sort-by="symbol">symbol</button>
    <button class="button" data-sort-by="number">number</button>
    <button class="button" data-sort-by="weight">weight</button>
    <button class="button" data-sort-by="category">category</button>
</div>

<div class="grid">
    <div class="element-item transition metal " data-category="transition">
        <h3 class="name">Mercury</h3>
        <p class="symbol">Hg</p>
        <p class="number">80</p>
        <p class="weight">200.59</p>
    </div>
    <div class="element-item metalloid " data-category="metalloid">
        <h3 class="name">Tellurium</h3>
        <p class="symbol">Te</p>
        <p class="number">52</p>
        <p class="weight">127.6</p>
    </div>
    <div class="element-item post-transition metal " data-category="post-transition">
        <h3 class="name">Bismuth</h3>
        <p class="symbol">Bi</p>
        <p class="number">83</p>
        <p class="weight">208.980</p>
    </div>
    <div class="element-item post-transition metal " data-category="post-transition">
        <h3 class="name">Lead</h3>
        <p class="symbol">Pb</p>
        <p class="number">82</p>
        <p class="weight">207.2</p>
    </div>
    <div class="element-item transition metal " data-category="transition">
        <h3 class="name">Gold</h3>
        <p class="symbol">Au</p>
        <p class="number">79</p>
        <p class="weight">196.967</p>
    </div>
    <div class="element-item alkali metal " data-category="alkali">
        <h3 class="name">Potassium</h3>
        <p class="symbol">K</p>
        <p class="number">19</p>
        <p class="weight">39.0983</p>
    </div>
    <div class="element-item alkali metal " data-category="alkali">
        <h3 class="name">Sodium</h3>
        <p class="symbol">Na</p>
        <p class="number">11</p>
        <p class="weight">22.99</p>
    </div>
    <div class="element-item transition metal " data-category="transition">
        <h3 class="name">Cadmium</h3>
        <p class="symbol">Cd</p>
        <p class="number">48</p>
        <p class="weight">112.411</p>
    </div>
    <div class="element-item alkaline-earth metal " data-category="alkaline-earth">
        <h3 class="name">Calcium</h3>
        <p class="symbol">Ca</p>
        <p class="number">20</p>
        <p class="weight">40.078</p>
    </div>
    <div class="element-item transition metal " data-category="transition">
        <h3 class="name">Rhenium</h3>
        <p class="symbol">Re</p>
        <p class="number">75</p>
        <p class="weight">186.207</p>
    </div>
    <div class="element-item post-transition metal " data-category="post-transition">
        <h3 class="name">Thallium</h3>
        <p class="symbol">Tl</p>
        <p class="number">81</p>
        <p class="weight">204.383</p>
    </div>
    <div class="element-item metalloid " data-category="metalloid">
        <h3 class="name">Antimony</h3>
        <p class="symbol">Sb</p>
        <p class="number">51</p>
        <p class="weight">121.76</p>
    </div>
    <div class="element-item transition metal " data-category="transition">
        <h3 class="name">Cobalt</h3>
        <p class="symbol">Co</p>
        <p class="number">27</p>
        <p class="weight">58.933</p>
    </div>
    <div class="element-item lanthanoid metal inner-transition " data-category="lanthanoid">
        <h3 class="name">Ytterbium</h3>
        <p class="symbol">Yb</p>
        <p class="number">70</p>
        <p class="weight">173.054</p>
    </div>
    <div class="element-item noble-gas nonmetal " data-category="noble-gas">
        <h3 class="name">Argon</h3>
        <p class="symbol">Ar</p>
        <p class="number">18</p>
        <p class="weight">39.948</p>
    </div>
    <div class="element-item diatomic nonmetal " data-category="diatomic">
        <h3 class="name">Nitrogen</h3>
        <p class="symbol">N</p>
        <p class="number">7</p>
        <p class="weight">14.007</p>
    </div>
    <div class="element-item actinoid metal inner-transition " data-category="actinoid">
        <h3 class="name">Uranium</h3>
        <p class="symbol">U</p>
        <p class="number">92</p>
        <p class="weight">238.029</p>
    </div>
    <div class="element-item actinoid metal inner-transition " data-category="actinoid">
        <h3 class="name">Plutonium</h3>
        <p class="symbol">Pu</p>
        <p class="number">94</p>
        <p class="weight">(244)</p>
    </div>
</div>
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